Immunohistochemical staining of Ki67 was performed to determine cell proliferation in the tumors. Each tissue section was counted manually in three different areas to assess the Ki67-positive cell index. Data were then presented as number of Ki67-positive cells per x 400 microscope field. Results are presented as the means s.d. **P < 0.001 by Student 's t-test, compared with control.

C. Impact of CYP17A1 inhibitors on genes involved in androgen biosynthesis. H295R cells were treated with control (DMSO) or 1 μM orteronel and galeterone for 72 h and then RNA was isolated and transcribed to cDNA. Results of qRT-PCR validation of HSD3B2, CYP17A1 and AKR1C3 genes relative to the housekeeping gene cyclophilin A. Expression of the genes was analyzed by SYBR Green real-time PCR. Analysis of relative gene expression was determined by the 2−ΔΔCt method. *p < 0.05.

Immunohistochemical staining of Ki67 was performed to determine cell proliferation in the tumors. Each tissue section was counted manually in three different areas to assess the Ki67-positive cell index. Data were then presented as number of Ki67-positive cells per x 400 microscope field. Results are presented as the means s.d. **P < 0.001 by Student 's t-test, compared with control.

C. Impact of CYP17A1 inhibitors on genes involved in androgen biosynthesis. H295R cells were treated with control (DMSO) or 1 μM orteronel and galeterone for 72 h and then RNA was isolated and transcribed to cDNA. Results of qRT-PCR validation of HSD3B2, CYP17A1 and AKR1C3 genes relative to the housekeeping gene cyclophilin A. Expression of the genes was analyzed by SYBR Green real-time PCR. Analysis of relative gene expression was determined by the 2−ΔΔCt method. *p < 0.05.